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In this randomized controlled study, participants (N = 520) from two universities in Canada and one in China were assigned to engage daily, for two weeks, in one of three activities: the Noticing Nature Intervention (NNI; notice how everyday nature makes you feel), Three Good Things (3GT), or an active placebo control activity. Post-intervention well-being (i.e. positive affect, meaning in life, transcendent connectedness, and elevation) and compassion were significantly higher and post-intervention ill-being (i.e. depression and anxiety) was significantly lower for the NNI versus controls (ds = 0.24 to 0.55). Compared to 3GT, transcendent connectedness, elevation and compassion were significantly higher for the NNI (ds = 0.41, 0.44, 0.23). The NNI was statistically equivalent to 3GT in boosting positive affect and meaning in life, and statistically non-inferior at lowering anxiety (boundary levels: d = -0.25, 0.25). Consistent with previous studies testing the NNI, benefits were not moderated by time in nature.
Passmore et al. (Sat,) studied this question.